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Spatial patterns of species richness and nestedness in ant assemblages along an elevational gradient in a Mediterranean mountain range

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  • Omar Flores
  • Javier Seoane
  • Violeta Hevia
  • Francisco M Azcárate

Abstract

Background: The study of biodiversity spatial patterns along ecological gradients can serve to elucidate factors shaping biological community structure and predict ecosystem responses to global change. Ant assemblages are particularly interesting as study cases, because ant species play a key role in many ecosystem processes and have frequently been identified as useful bioindicators. Methods: Here we analyzed the response of ant species richness and assemblage composition across elevational gradients in Mediterranean grasslands and subsequently tested whether these responses were stable spatially and temporally. We sampled ant assemblages in two years (2014, 2015) in two mountain ranges (Guadarrama, Serrota) in Central Spain, along an elevational gradient ranging from 685 to 2390 m a.s.l. Results: Jackknife estimates of ant species richness ranged from three to 18.5 species and exhibited a hump-shaped relationship with elevation that peaked at mid-range values (1100–1400 m). This pattern was transferable temporally and spatially. Elevation was related to ant assemblage composition and facilitated separation of higher elevation assemblages (> 1700 m) from the remaining lower elevation species groups. Ant assemblages were nested; therefore species assemblages with a decreased number of species were a subset of the richer assemblages, although species turnover was more important than pure nestedness in all surveys. The degree of nestedness changed non-linearly as a cubic polynomial with elevation. These assembly patterns coincided more clearly over time than between the two study regions. Discussion: We suggest double environmental stressors typical of Mediterranean mountains explained species richness patterns: drought at low elevations and cold temperatures at high elevations likely constrained richness at both extremes of elevational gradients. The fact that species turnover showed a dominant role over pure nestedness suggested current ant assemblages were context-dependent and highly vulnerable to global change, which threatens the conservation of present day native ant communities, particularly at high elevations.

Suggested Citation

  • Omar Flores & Javier Seoane & Violeta Hevia & Francisco M Azcárate, 2018. "Spatial patterns of species richness and nestedness in ant assemblages along an elevational gradient in a Mediterranean mountain range," PLOS ONE, Public Library of Science, vol. 13(12), pages 1-16, December.
    • Handle: RePEc:plo:pone00:0204787
    DOI: 10.1371/journal.pone.0204787
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    References listed on IDEAS

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    1. Tim Szewczyk & Christy M McCain, 2016. "A Systematic Review of Global Drivers of Ant Elevational Diversity," PLOS ONE, Public Library of Science, vol. 11(5), pages 1-18, May.
    2. Intergovernmental Panel on Climate Change IPCC, 2008. "Intergovernmental Panel on Climate Change: Fourth Assessment Report: Climate Change 2007: Synthesis Report," Working Papers id:1325, eSocialSciences.
    3. Leigh G Torres & Philip J H Sutton & David R Thompson & Karine Delord & Henri Weimerskirch & Paul M Sagar & Erica Sommer & Ben J Dilley & Peter G Ryan & Richard A Phillips, 2015. "Poor Transferability of Species Distribution Models for a Pelagic Predator, the Grey Petrel, Indicates Contrasting Habitat Preferences across Ocean Basins," PLOS ONE, Public Library of Science, vol. 10(3), pages 1-18, March.
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